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对高等级公路多功能养护车的结构与性能特点进行了分析，着重研究了该车的液压系统、夯拔装置的性能与结构设计，通过比较分析，得出了夯拔装置的最优设计。
The structure and performance characteristics of the high-class highway multi-purpose maintenance vehicle are analyzed. The performance and structure design of the hydraulic system and the ram-pulling device of the vehicle are emphatically studied. Through the comparative analysis, the optimal design of the ram-pulling device is obtained.